? Features Superb sound quality Free change between hands free speakerphone and stereo music The earphone can automatically change into call mode when somebodys calls you and you're enjoying music After call is over， the earphone will automatically change into music play mode High SNR voice frequency transmission within 10m High sensitivity built-in microphone allows wireless chatting through network General Specs Brand Rapoo Model H6020 Sound Excellent super stereo sound Earphone Type Wireless earphone Bluetooth Protocol 2.1+EDR Battery Built-in lithium battery Charge Time 3 h Talk Time 16 h  Bluetooth Service Time 12 h Others Microphone